Itachi can use amaterasu if he was serious and he can spam it without limits as he is an edo. kabuto don't stand a chance especially inside a closed arena against an edo itachi whose chakra and regeneration is limitless and no side effects.
ah well then we go into context specifics. Kabuto & Itachi are way too situational ninja. We talking ET? We talking Sasuke? We talking intent? We talking intel? We talking Edo bodies? Let's agree to disagree hahaaaa, I personally believe Itachi fights with genjutsu primarily.
Yeah that point is right though he mainly starts the battle with a genjutsu his signature move.
MS/EMS Sasuke cuz no izanami knowledge.
kinishiki is too strong for him
He isn't beating Sakura/Tsunade.